scholarly journals Quantum correlations induced by multiple scattering of quadrature squeezed light

2006 ◽  
Vol 14 (15) ◽  
pp. 6919 ◽  
Author(s):  
Peter Lodahl
Keyword(s):  
Multiple Scattering ◽  
Quantum Correlations ◽  
Squeezed Light

scholarly journals On Amplification of Light in the Continuous EPR State

2003 ◽  
Vol 01 (02) ◽  
pp. 207-215 ◽  
Author(s):  
V. N. Gorbachev ◽  
A. I. Trubilko
Keyword(s):  
Quantum Correlations ◽  
Continuous Variable ◽  
The Other ◽  
Atomic Ensemble ◽  
Transparent Medium ◽  
Integrals Of Motion ◽  
Squeezed Light ◽  
Type Interaction ◽  
Epr State

Two schemes of amplification of two-mode squeezed light in the continuous variable EPR-state are considered. They are based on the integrals of motion, which allow conserving quantum correlations whereas the power of each mode may increase. One of these schemes involves a three-photon parametric process in a nonlinear transparent medium and the other is a Raman type interaction of light with atomic ensemble. A generalization to multimode squeezed light is discussed.

Measure of general quantum correlations in optomechanics

2018 ◽  
Vol 16 (05) ◽  
pp. 1850043 ◽  
Author(s):  
M. Amazioug ◽  
M. Nassik ◽  
N. Habiballah
Keyword(s):  
Bath Temperature ◽  
Quantum Correlations ◽  
Atomic Ensemble ◽  
Thermal Bath ◽  
Optomechanical System ◽  
Optomechanical Systems ◽  
Squeezed Light ◽  
Quantum Steering ◽  
Quantum Equations ◽  
Gaussian Quantum Discord

In this paper, we analyze nonclassical correlations between bipartite states in two optomechanical systems. The first system (Sec. 2) consists of two nanoresonators spatially separated by broadband squeezed light, where each cavity has a fixed mirror and a movable one. The second system (Sec. 3) is an atom-optomechanical system consisting of an atomic ensemble placed inside an optical nanoresonator with a vibrating mirror. For both optomechanical systems, we give the Hamiltonian and the explicit expression of covariance matrix leading to the quantum equations describing the dynamic evolution of the system. Then, the nonclassical correlations are quantified using the logarithmic negativity and Gaussian quantum discord. We propose also a scheme for examining the evolution of Gaussian quantum steering and its asymmetry in each system. We show that the entanglement of the two mechanical modes is very strongly related to the parameters characterizing the environment where the movable mirrors evolve, in particular the squeeze parameter, the optomechanical cooperativity and thermal bath temperature.

scholarly journals Observation of Spatial Quantum Correlations Induced by Multiple Scattering of Nonclassical Light

2009 ◽  
Vol 102 (19) ◽  
Author(s):  
S. Smolka ◽  
A. Huck ◽  
U. L. Andersen ◽  
A. Lagendijk ◽  
P. Lodahl
Keyword(s):  
Multiple Scattering ◽  
Quantum Correlations ◽  
Nonclassical Light

Dynamics of classical-quantum correlations between two movable mirrors in optomechanics

2020 ◽  
Vol 34 (08) ◽  
pp. 2050066 ◽  
Author(s):  
M. Amazioug ◽  
L. Jebli ◽  
M. Nassik ◽  
N. Habiballah
Keyword(s):  
Thermal State ◽  
Quantum Correlations ◽  
Strong Coupling Regime ◽  
Squeezed Light ◽  
Fabry Perot ◽  
Classical Quantum ◽  
Rotating Wave ◽  
Quantum Mutual Information ◽  
Down Conversion ◽  
Gaussian Quantum Discord

We study the dynamics of classical-quantum correlations in the nonadiabatic regime, using the rotating wave approximation (RWA), between two movable mirrors of two spatially separated Fabry–Pérot cavities, each of the two cavities having a movable end-mirror and coupled to a two-mode squeezed light from spontaneous parametric down-conversion. This work completes our previous work [M. Amazioug, M. Nassik and N. Habiballah, Eur. Phys. J. D 72, 171 (2018)] where we have studied the transfer of quantum correlations in steady state. The Bures distance is used to quantify the amount of entanglement of the symmetrical squeezed thermal state, and the Gaussian quantum discord is considered to quantify the quantumness of the quantum correlations even though the two movable mirrors are separable. Furthermore, total correlations are quantified using quantum mutual information. Indeed, these three indicators depend mainly on the temperature of the movable mirror and the squeezing parameter in strong coupling regime.

scholarly journals Nonclassical correlations in a two-mode optomechanical system

2016 ◽  
Vol 30 (20) ◽  
pp. 1650134 ◽  
Author(s):  
J. El Qars ◽  
M. Daoud ◽  
R. Ahl Laamara
Keyword(s):  
Quantum Correlations ◽  
Optomechanical System ◽  
Squeezed Light ◽  
Wide Range ◽  
Optical Modes ◽  
System Temperature ◽  
Optomechanical Coupling ◽  
Two Hybrid

The pairwise quantum correlations in a tripartite optomechanical system comprising a mechanical mode and two optical modes are analyzed. The Simon criterion is used as a witness of the separability. Whereas the Gaussian discord is employed to capture the quantumness of correlations. Both entanglement and Gaussian discord are evaluated as functions of the parameters characterizing the environment and the system (temperature, squeezing and optomechanical coupling). We work in the resolved-sideband regime. We show that it is possible to reach three simultaneous bipartite entanglements via the quantum correlations transfer from the squeezed light to the system. While, even without squeezed light, the quantumness of correlations can be captured simultaneously between the three modes for a very wide range of parameters. Specifically, we find that the two optical modes exhibit more quantum correlations in comparison with the entangled mechanical–optical modes. Finally, unlike the two hybrid subsystems, the purely optical one seems more resilient against the environmental destructive effects.

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